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The papers provided in this party tested the main major points of diagnostic recommendations, emphasizing the significance of predictive upkeep in decreasing creation shortages and the prices of plant administration. The contributions of those authors enable a serious comparability of the various reports in constructing and utilizing the several diagnostic methodologies hired in numerous elements of the area. the next difficulties are mentioned: features of situation tracking structures - info acquisition strategies and information processing methodologies; collection of transducers and of dimension element destinations; facts compression options; alarm degrees evaluate (acceptance regions); options for detecting malfunction stipulations; diagnostic methodologies for the online and off-line id of the reason for fault; specialist platforms; definition of the tips for the presentation up to speed rooms of tracking info and diagnostic effects; rotordynamic versions used, off-line, to substantiate faults clinically determined on-line.

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Additional info for Diagnostics of Rotating Machines in Power Plants: Proceedings of the CISM/IFToMM Symposium, October 27–29, 1993, Udine, Italy

Example text

ADRE, provide a record of shaft position changes during the machine FiJllll"O 9. startup. Figure 9 shows an example of this. type of data. As can be seen, for this bearing location the shaft position appears to be too high in the clearance. In fact, this particular machine was determined to have significant vertical misalignment. ,... ,, _ - LOW AMPLITUDE DOES NOT NECESSARILY MEAN A HEALTHY MACHINE After the startup of a gas compressor at a chemical facility, vibration amplitude readings were considered "normal" for all bearings on the machine.

Kanki et al. 1. This is a diagnosing system using a knowledge base which is a set of knowledge for diagnosis collected from human experts. The knowledge base includes not only simple numerical data but also non-numerical knowledge. There have been several methods of expression proposed for knowledge bases, but the commonly used IF-THEN method is adopted for the vibration diagnostic expert system for steam turbines developed this time. This is because FMECA (Failure Modes Effects and Criticality Analysis) [4] has been adopted to infer causes of troubles in steam turbine generator rotor systems and because fault trees have been well developed for trouble analysis.